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Ange Albertini
142 lines
2.9 KiB
NASM
142 lines
2.9 KiB
NASM
; a minimalist hello-world Mach-O binary
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; Ange Albertini, BSD 2013
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; from Nicolas Seriot's http://seriot.ch/hello_macho.php
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; constants & structs **********************************************************
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CPU_TYPE_I386 equ 7
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CPU_SUBTYPE_I386_ALL equ 3
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MH_MAGIC equ 0FEEDFACEh
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MH_EXECUTE equ 2
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MH_NOUNDEFS equ 1
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struc mach_header
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.magic resd 1
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.cputype resd 1
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.cpusubtype resd 1
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.filetype resd 1
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.ncmds resd 1
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.sizeofcmds resd 1
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.flags resd 1
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endstruc
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LC_SEGMENT equ 1
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LC_UNIXTHREAD equ 5
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x86_THREAD_STATE_32 equ 1
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_x equ 1
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_w equ 2
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_r equ 4
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struc segment_command
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.cmd resd 1
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.cmdsize resd 1
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.segname resb 16
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.vmaddr resd 1
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.vmsize resd 1
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.fileoff resd 1
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.filesize resd 1
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.maxprot resd 1
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.initprot resd 1
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.nsects resd 1
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.flags resd 1
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endstruc
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struc thread_command
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.cmd resd 1
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.cmdsize resd 1
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.flavor resd 1
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.count resd 1
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; .state ; starts here
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endstruc
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struc i386_thread_state
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.eax resd 1
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.ebx resd 1
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.ecx resd 1
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.edx resd 1
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.edi resd 1
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.esi resd 1
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.ebp resd 1
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.esp resd 1
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.ss resd 1
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.eflags resd 1
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.eip resd 1
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.cs resd 1
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.ds resd 1
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.es resd 1
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.fs resd 1
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.gs resd 1
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endstruc
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; header ***********************************************************************
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bits 32
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istruc mach_header
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at mach_header.magic, dd MH_MAGIC
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at mach_header.cputype, dd CPU_TYPE_I386
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at mach_header.cpusubtype, dd CPU_SUBTYPE_I386_ALL
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at mach_header.filetype, dd MH_EXECUTE
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at mach_header.ncmds, dd 2 ; 1 segment command + 1 thread command
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at mach_header.sizeofcmds, dd SC_SIZE + TC_SIZE
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at mach_header.flags, dd MH_NOUNDEFS
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iend
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sc:
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istruc segment_command
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at segment_command.cmd, dd LC_SEGMENT
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at segment_command.cmdsize, dd SC_SIZE
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at segment_command.segname, db "__TEXT"
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at segment_command.vmsize, dd 1000h
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at segment_command.filesize, dd 64
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at segment_command.maxprot, db _r + _w + _x
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at segment_command.initprot, dd _r + _x
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iend
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SC_SIZE equ $ - sc
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tc:
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istruc thread_command
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at thread_command.cmd, dd LC_UNIXTHREAD
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at thread_command.cmdsize, dd TC_SIZE
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at thread_command.flavor, dd x86_THREAD_STATE_32
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at thread_command.count, dd STATE_SIZE >> 2
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iend
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state:
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istruc i386_thread_state
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at i386_thread_state.eip, dd entrypoint
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iend
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STATE_SIZE equ $ - state
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TC_SIZE equ $ - tc
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; EntryPoint code **************************************************************
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STDOUT equ 1
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SC_EXIT equ 1
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SC_WRITE equ 4h
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entrypoint:
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push MSG_SIZE
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push msg
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push STDOUT
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mov al, SC_WRITE
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sub esp, 1 * 4
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int 80h
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add esp, 4 * 4
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push 0
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mov al, SC_EXIT
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sub esp, 4
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int 80h
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; data *************************************************************************
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msg db 'Hello world', 0ah
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MSG_SIZE equ $ - msg
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